The humidity is available in 2% or 3% RH accuracies and outputs of 4 to 20mA, 0 to 5V, 0 to 10V or 2 to 10V. The Platinum RTD Temperature Transmitter has a 4-20mA output. The units come with a watertight polycarbonate BAPI-Box IP66/NEMA 4 rated enclosure.

Plat. RTD Temp Transmitter with 4 to 20mA Output

2% and 3% RH Accuracies with 4 to 20mA, 0 to 5, 0 to 10 or 2 to 10V Output

BAPI's certification form matches the requirements of the National Institute of Standards and Technology data reporting standard.
The column labeled "Reference" is the actual test condition as measured by the Calibration Standards referenced in the inventory …

Most modern HVAC control systems have 24 VAC available, and most of BAPI’s products can run on 24 VAC, yet BAPI recommends powering them with DC voltage. Why?
Twisted wire cables have high wire-to-wire capacitance. Capacitors …

BAPI’s standard product accuracy is either ±3.0% or ±2.0% relative humidity. BAPI can provide an NIST Traceable Certificate of Calibration for each humidity transmitter that corrects each sensor and transmitter assembly to ±1% relative humidity …

The IEC (International Electrotechnical Commision) is an international committee that developes and publishes its recommendations for standardising international wiring devices and products. Ingress Protection (IP) is the grades of protection against external solids contacting the …

The National Electrical Manufacturers Association (NEMA) Standards Publication No. 250 defines 13 different enclosure “types” for non-hazardous locations. These NEMA types define the applications and the environmental conditions that enclosures are designed to protect against …

Building Automation Products, Inc. (BAPI), a leading manufacturer of HVAC/R control system sensors and peripherals, is committed to environmentally responsible manufacturing practices. BAPI has been working since early 2005 to remove environmentally harmful materials from …

Shown below is an NIST Traceable Certificate of Calibration for a recent T1K Temperature Transmitter order.
Each transmitter is calibrated for its range using precision resistors. A Class A RTD is given a unique serial number …

All of BAPI’s indoor sensor bodies and transmitter enclosures are made from UL94, V-0 rated plastics.
UL94 serves as a preliminary indication of a plastic’s acceptability for use as part of a device or appliance with …

This document describes how noise is created on sensor cables by 24 VAC power, how this noise can adversely affect the HVAC controller’s operation, and how to prevent the AC power noise.
Noise Caused by AC …

Current Loop History
Many of us still remember the days of pneumatic control; some of us still use pneumatic control systems. Ratio controllers, PID controllers, temperature sensors and actuators are powered by compressed air. Three to …

NIST (National Institute of Standards and Technology) Traceability can be defined as an unbroken record of documentation (“documentation traceability”) for the measurement device authenticity and an unbroken chain of measurements (with documentation with associated uncertainties) …

Many BAPI customers ask how long will a humidity sensor last.
BAPI has been supplying humidity sensors for 14 years. We estimate that over 90% of these units are still in service meeting their original specifications. …

Building Automation Products Incorporated (BAPI) certifies that our humidity transmitters have been produced, inspected, and tested in compliance with applicable drawings, specifications, and standards by the manufacturer. These products meet or exceed published specifications and …

This document describes five of the most basic 4 to 20 mA current loop configurations:
1. A two-wire transmitter with external power and an external resistor
2. A two-wire transmitter with controller power and a 4 to …

The physical placement of BAPI outdoor temperature and humidity sensors depends on its application.
If the outside air is being used for economizing, the sensor should be placed close to the economizer damper without being in …